Generally, the application programmer writes a service that is part of an XA-compliant server group to perform some operation via the group’s resource manager. In the normal case, the service expects to perform all operations within a transaction. If, on the other hand, the service is called with the communication flags set to TPNOTRAN, you may receive unexpected results when executing database operations.

In order to avoid unexpected behavior, design the application so that services in groups associated with XA-compliant resource managers are always called in transaction mode or are always defined in the configuration file with AUTOTRAN set to Y. You must also test the transaction level in the service code early.